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Retirement Plan	12 Months Ended
Retirement Plan	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Retirement Plan	Retirement Plan We maintain a defined contribution plan covering full-time shoreside employees who have completed the minimum period of continuous service. Annual contributions to the plan are discretionary and are based on fixed percentages of participants' salaries and years of service, not to exceed certain maximums. Contribution expenses were $16.7 million, $16.8 million and $15.4 million for the years ended December 31, 2016, 2015 and 2014, respectively.